<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>06_promise</title>
</head>

<body>
    <script>
        //promise ajax请求
        const p = new Promise(function (resolve, reject) {
            let xhr = new XMLHttpRequest()
            xhr.open('GET', 'https://api.apiopen.top/getJoke')
            xhr.send()
            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4) {
                    if (xhr.status >= 200 && xhr.status < 300) {
                        //console.log(xhr.response)
                        resolve(xhr.response)
                    } else {
                        reject(xhr.status)
                    }
                }
            }
        })
        p.then(function (value) {
            console.log(value)
        }, function (reson) {
            console.error(reson)
        })


    </script>
</body>

</html>